Preservice teachers' beliefs about effective teachers were examined with the repertory grid technique. Second- and fourth-year preservice teachers (N=22) were randomly selected to participate in a computerized repertory grid exercise. The computer program led the subjects through a series of steps that allowed them to compare and contrast the characteristics of teachers that they had identified. Subjects' responses were factor-analyzed by the computer program. Students were then given a chart that summarized their ideas about characteristics of good teachers and were asked to complete a questionnaire about their interpretations of this summary. Some qualitative differences between the responses of second- and fourth-year students are reported. Implications for further research are discussed. (Author/IAH)